HTML & CSS
What problems / errors / warnings are you getting? What is your sitemap.xml URL?
Please check the sitemap.xml path which you are submit in the bing search engine. If you are using the wrong path. Then sitemap XML is showing the problem.
Is your problem that your sitemap is always showing as pending in Bing webmaster tools? If so this has been a problem
for some time, and currently it can take about 2 weeks before a sitemap is downloaded. There is a long thread about it
on the Bing community forum.